CLZSS::CompressNoAlloc

/* CLZSS::CompressNoAlloc(unsigned char*, int, unsigned char*, unsigned int*) */

uchar * __thiscall
CLZSS::CompressNoAlloc(CLZSS *this,uchar *param_1,int param_2,uchar *param_3,uint *param_4)

{
  byte *pbVar1;
  int iVar2;
  byte *pbVar3;
  int iVar4;
  uchar *puVar5;
  int iVar6;
  int iVar7;
  int iVar8;
  undefined1 *puVar9;
  undefined1 *puVar10;
  undefined4 *puVar11;
  int in_GS_OFFSET;
  undefined4 uStack_880;
  int aiStack_87c [3];
  undefined4 auStack_870 [513];
  undefined1 auStack_6c [16];
  uint *local_5c;
  uchar *local_58;
  byte *local_54;
  byte *local_50;
  int local_4c;
  uint local_48;
  byte *local_44;
  byte *local_40;
  byte local_39;
  CLZSS *local_38;
  undefined4 *local_34;
  int local_30;
  int local_20;
  
  local_38 = this;
  local_58 = param_3;
  local_5c = param_4;
  local_20 = *(int *)(in_GS_OFFSET + 0x14);
  puVar9 = auStack_6c;
  if (0x10 < (uint)param_2) {
    *(undefined4 **)this = auStack_870;
    puVar11 = auStack_870;
    for (iVar6 = 0x200; iVar6 != 0; iVar6 = iVar6 + -1) {
      *puVar11 = 0;
      puVar11 = puVar11 + 1;
    }
    iVar6 = -(*(int *)(this + 8) * 0x10 + 0x10);
    puVar10 = (undefined1 *)((int)aiStack_87c + iVar6);
    *(int *)(this + 4) = (int)auStack_870 + iVar6;
    *(int *)((int)aiStack_87c + iVar6 + 8) = *(int *)(this + 8) * 0x10;
    *(undefined4 *)((int)aiStack_87c + iVar6 + 4) = 0;
    *(int *)((int)aiStack_87c + iVar6) = (int)auStack_870 + iVar6;
    *(undefined4 *)((int)&uStack_880 + iVar6) = 0x2544fb;
    memset(*(void **)((int)aiStack_87c + iVar6),*(int *)((int)aiStack_87c + iVar6 + 4),
           *(size_t *)((int)aiStack_87c + iVar6 + 8));
    local_58[0] = 'L';
    local_58[1] = 'Z';
    local_58[2] = 'S';
    local_58[3] = 'S';
    local_44 = local_58 + 8;
    local_54 = local_58 + param_2 + -0x10;
    *(int *)(local_58 + 4) = param_2;
    puVar9 = (undefined1 *)((int)aiStack_87c + iVar6);
    if (0 < param_2) {
      local_48 = 0;
      local_50 = (byte *)0x0;
      local_40 = (byte *)0x0;
      do {
        if (local_48 == 0) {
          local_4c = 0;
          *local_44 = 0;
          local_50 = local_44;
          local_44 = local_44 + 1;
        }
        else {
          local_4c = (int)(uint)*local_50 >> 1;
        }
        local_48 = local_48 + 1 & 7;
        local_30 = 0x10;
        if (param_2 < 0x11) {
          local_30 = param_2;
        }
        local_39 = *param_1;
        local_34 = *(undefined4 **)(*(int *)local_38 + (uint)local_39 * 8);
        if (local_34 == (undefined4 *)0x0) {
LAB_002546d1:
          iVar8 = 1;
          *local_50 = (byte)local_4c;
          *local_44 = *param_1;
          local_44 = local_44 + 1;
          pbVar3 = param_1;
        }
        else {
          iVar8 = 0;
          do {
            if ((local_30 == 0) || (pbVar3 = (byte *)*local_34, local_39 != *pbVar3)) {
              iVar7 = 0;
            }
            else {
              iVar2 = 1;
              do {
                iVar7 = iVar2;
                iVar4 = local_30;
                if (iVar7 == local_30) break;
                iVar4 = iVar7;
                iVar2 = iVar7 + 1;
              } while (pbVar3[iVar7] == param_1[iVar7]);
              if (iVar8 < iVar4) {
                local_40 = pbVar3;
                iVar8 = iVar7;
              }
            }
          } while ((iVar7 != local_30) &&
                  (puVar11 = local_34 + 2, local_34 = (undefined4 *)*puVar11,
                  (undefined4 *)*puVar11 != (undefined4 *)0x0));
          if (iVar8 < 3) goto LAB_002546d1;
          *local_50 = (byte)local_4c | 0x80;
          *local_44 = (byte)((int)(param_1 + (-1 - (int)local_40)) >> 4);
          local_44[1] = (char)iVar8 - 1U | (char)(param_1 + (-1 - (int)local_40)) * '\x10';
          local_44 = local_44 + 2;
          pbVar3 = param_1;
        }
        do {
          pbVar1 = pbVar3 + 1;
          *(byte **)((int)aiStack_87c + iVar6 + 4) = pbVar3;
          *(CLZSS **)((int)aiStack_87c + iVar6) = local_38;
          *(undefined4 *)((int)&uStack_880 + iVar6) = 0x254614;
          BuildHash(*(CLZSS **)((int)aiStack_87c + iVar6),*(uchar **)((int)aiStack_87c + iVar6 + 4))
          ;
          pbVar3 = pbVar1;
        } while ((int)pbVar1 - (int)param_1 < iVar8);
        iVar7 = 1;
        if (0 < iVar8) {
          iVar7 = iVar8;
        }
        param_2 = param_2 - iVar8;
        param_1 = param_1 + iVar7;
        puVar9 = (undefined1 *)((int)aiStack_87c + iVar6);
        if (local_54 <= local_44) goto LAB_0025470d;
      } while (0 < param_2);
      puVar9 = (undefined1 *)((int)aiStack_87c + iVar6);
      if (param_2 == 0) {
        if (local_48 == 0) {
          *local_44 = 1;
          local_44 = local_44 + 1;
        }
        else {
          *local_50 = (byte)((int)((int)(uint)*local_50 >> 1 | 0x80U) >>
                            (7U - (char)local_48 & 0x1f));
        }
        *local_44 = 0;
        local_44[1] = 0;
        puVar5 = local_58;
        if (local_5c != (uint *)0x0) {
          *local_5c = (uint)(local_44 + (2 - (int)local_58));
          puVar10 = (undefined1 *)((int)aiStack_87c + iVar6);
        }
        goto LAB_0025470f;
      }
    }
  }
LAB_0025470d:
  puVar5 = (uchar *)0x0;
  puVar10 = puVar9;
LAB_0025470f:
  if (local_20 != *(int *)(in_GS_OFFSET + 0x14)) {
                    /* WARNING: Subroutine does not return */
    *(undefined **)(puVar10 + -4) = &UNK_00254748;
    __stack_chk_fail();
  }
  return puVar5;
}